Publication date: 15th December 2025
Nonreciprocal optical behavior, the ability of a material to absorb or emit light differently depending on the direction of propagation, has traditionally required magneto-optical fields, complex metamaterials, or delicate nanophotonic architectures. Here we show that readily synthesized, solution-processed colloidal nanomaterials can intrinsically support nonreciprocal light–matter interactions when their chiral and linear anisotropies are engineered to interferometrically couple. Using the Stokes–Mueller formalism, we derive a compact analytical expression that identifies the conditions to produce nonreciprocal absorption and emission of orthogonal linear polarizations. We experimentally validate these predictions in thin films of CdS, CdSe, and CdTe magic-size clusters [1-4] whose comparable circular and linear dichroism provide an ideal platform for testing this theory. By tuning cluster organization and anisotropy, we direct the sign and magnitude of the nonreciprocal response and establish design rules for achieving directional polarization selectivity without external fields or structural asymmetry. These results broaden the fundamental photophysics of confined semiconductor nanocrystals, revealing that nonreciprocity can emerge in macroscopically isotropic, low-dimensional materials through purely optical interference. The ability to achieve direction-dependent polarization control in scalable quantum-confined films opens new avenues for device concepts spanning optical routing, polarization-multiplexed information processing, and compact logic elements, helping bridge fundamental nanomaterial physics with next-generation optoelectronic technologies
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